Charged Pion Production From Neutron Proton Collisions At 790 Mev Differential Cross Sections Symmetry
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Total Pages | : |
Release | : 1977 |
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The two reactions np .-->. nn.pi. and np .-->. pp.pi.− were studied at 790 MeV (incident neutron energy). Pion spectra were measured at 10 different angles with a multiwire proportional chamber spectrometer. Approximately 100,000 events were analyzed. The angular distribution of pions in the np center of momentum system (d sigma/d.cap omega.*) was given by ((123.1 +- 2.7) + (88.3 +- 4.9)cos2(theta*))(.mu.b/sr). The cross section sigma(np .-->. NN.pi./sup +-/) was determined to be 1.92 +- 20 mb by integrating (d sigma/d.cap omega.*) over all angles. The partial cross section for pion production from T = 0 np interactions (sigma01) was found to be .1/sub -.1//sup +.5/ mb by using the relation sigma01 = 2sigma(np .-->. NN.pi./sup +- )--sigma(pp .-->. pp.pi.°). Stronger indications of nonresonant pion production were given by the presence of asymmetries between the positive and negative pion spectra and a comparison of the data with an isobar model calculation.
Author | : Willard Roy Thomas |
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Total Pages | : 252 |
Release | : 1977 |
Genre | : Mesons |
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Author | : |
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Total Pages | : 548 |
Release | : 1978 |
Genre | : Power resources |
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Total Pages | : 852 |
Release | : 1990 |
Genre | : Power resources |
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Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Author | : Francis A. Cucinotta |
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Total Pages | : 30 |
Release | : 1998 |
Genre | : Extraterrestrial radiation |
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Author | : Steve R. Blattnig |
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Total Pages | : 88 |
Release | : 2000 |
Genre | : Particles (Nuclear physics) |
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Author | : John W. Norbury |
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Total Pages | : 50 |
Release | : 2002 |
Genre | : Extraterrestrial radiation |
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Author | : John W. Norbury |
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Total Pages | : 32 |
Release | : 1986 |
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Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 46 |
Release | : 2018-05-29 |
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ISBN | : 9781720454991 |
Ranft has provided parameterizations of Lorentz invariant differential cross sections for pion and nucleon production in pion-proton collisions that are compared to some recent data. The Ranft parameterizations are then numerically integrated to form spectral and total cross sections. These numerical integrations are further parameterized to provide formula for spectral and total cross sections suitable for use in radiation transport codes. The reactions analyzed are for charged pions in the initial state and both charged and neutral pions in the final state.Norbury, John W. and Blattnig, Steve R. and Norman, Ryan and Tripathi, R. K.Langley Research CenterNUCLEONS; PARAMETERIZATION; PIONS; PAIR PRODUCTION; IONIC COLLISIONS; SCATTERING CROSS SECTIONS; RADIATION TRANSPORT; LORENTZ TRANSFORMATIONS; CYLINDRICAL COORDINATES; CHARGED PARTICLES
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Total Pages | : 848 |
Release | : 1989 |
Genre | : Power resources |
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